There is no doubt that Cardano is a very ambitious project with a solid foundation in science litterature.
Cardano is more than just a crypto payment system. It’s an entire platform for doing business much more effectively than on the Ethereum platform. Faster and cheaper.
But Cardano still lack the same quality documentation for developers as Ethereum have. Some areas are very well documented. Others not so much.
Regarding the price of 1 ADA then nobody knows where it will go. You could argue that if Cardano succeed in becoming the most used platform for defi then we must expect the value of ADA to go up up. If not then then price will drop further.
My guess for whatever it’s worth is that Cardano is here to stay and will have a huge impact on the future of crypto. My expectation is that the ADA price will go up in the coming years.